There are more and more things later on, such as the option to funnel stat points into fetish stats, and sensitivity/fetish matters the more lewd scenes you do.Okay so I think I managed to boil my thoughts down a bit to:
Nothing done during Alicia's gameplay affects the roya gameplay
I don't know if it's intentional or not, but even picking a sensitivity and fetish very rarely comes up if at all
If at the start you skip 20 days by just sleeping and using the corruption as aura
The roya gameplay would then just start with little to no difference
You'd have done 2 or 3 masturbation scenes, yes, but none of the mind changes would really make you do any more lewd things or change your roya playthrough any way
But early on there indeed isn't much. Not that I think there would need to be.